Variables not set in adapter testing framework

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The problem I’m having

When running the basic tests for an adapter as shown in this guide, I’m not seeing variables being set in the created dbt_project.yml file.
The contents of the created project file for the basic test is

name: generic_tests
profile: test

In my models/schema.yml the variables target and seed_name are being used but, aren’t set in the project.

version: 2
sources:
  - name: raw
    schema: "{{ var('target','schema') }}"
    tables:
      - name: seed
        identifier: "{{ var('seed_name', 'base') }}"

In this test, I don’t see these variables being overridden anywhere. How are these supposed to be set?

The context of why I’m trying to do this

Upgrading an adapter to support dbt-core v1.7